NBME 21

nbme21/Block 1/Question#28

A 47-year-old man is brought to the emergency ...

Mixed venous oxygen tension

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submitted by hayayah(54),

Mixed venous oxygen saturation (SvO2) is measured in the pulmonary artery. SvO2 samples the true mixed venous blood leaving the right heart. Measurement of mixed venous oxygen saturation (SvO2) from the pulmonary artery has been advocated as an indirect index of tissue oxygenation.

In cardiogenic shock you have decreased CO --> decreased O2 delivery --> decreased SvO2.